Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef84bd556b673b896225d80fee026bc46b75f7da1c594b3c8217c20ea0352240' 
  AND token = '9ZBLSZB02MuQFK3LHm9X+NWfF9e91UwHI3Wt6oPFqWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}